Studies toward Antarctic Micrometeorite classification using abundant collection

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We studied abundant Antarctic Micrometeorites collected by JARE-37, 38, 39 and 41, where JARE is Japanese Antarctic Research Expedition. Samples from JARE-37 and 38 were recovered from water tank for life in the Dome Fuji Station, those from JARE-39 from the Yamato meteorite bare icefield, and those from JARE-41 from the Tottuki bare ice area. Especially, important results were obtained from the study focused on the hydrously altered minerals. Generally, most of cosmic dust consists of hydrously altered minerals (more than 50%). On the other hand, meteorites consisting of hydrous minerals are limited to carbonaceous chondrites (〜1%). This mode of difference suggests that hydrous minerals in space fall as mostly cosmic dust, being ascribed from the fragile substance of the material. We found that recent fell Tagish Lake meteorite, which is a new type of hydrously altered carbonaceous chondrite, has a close relationship with the Antarctic micrometeorites.In the 4th year of our research period, we summarized our study and compiled our 18 published papers, list of 41 abstracts and catalog of Japanese Antarctic Micrometeorites with more than 300 pages.